Flask



FIG. 1 is a perspective view of the flask showing my new design;

FIG. 2 is a front view thereof, the rear view being a mirror image ofthe front view;

FIG. 3 is a right side view thereof, the left side view being a mirrorimage of the right side view;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines are for illustrative purposes only and form no part ofthe claimed design.

CLAIM The ornamental design for a flask, as shown and described.